Question

初二数学题,急求解!!!!!!

(a+b)(x+y)-(a+b)(x-y)分解因式
拜托别裸奔啊!!!!!!!!!!!!

Answer 1

分解为ax+ay+bx+by-ax+ay-bx+by
=ay+by+ay+by
=2ay+2by
=2y(a+b)

Answer 2

(a+b)(x+y)-(a+b)(x-y)
=(a+b）平方-（x平方-y平方）
=a平方+2ab+b平方-x平方+y平方

Answer 3

(a+b)(x+y-x+y)=2y . (a+b)